Earth system model (cesm) practical technology

Current universal earth system model （Community Earth System Model,CESM） Studying the past of the earth 、 It is more and more widely used in current and future climate conditions .CESM By the United States NCAR On 2010 year 07 Since launch in , It has been paid close attention by the climatology circle . Upgraded in recent years CESM2.0 In the atmosphere 、 land 、 ocean 、 sea ice 、 Lu Bing 、 Several modules such as runoff and a central coupler （CIME） There are major updates in , It can be ported on different hardware platforms , In particular, it can be used for CMIP6 The study of . CESM2.0 in CIME (Common Infrastructure for Modeling the Earth) Configure for mode 、 Compile and run to provide a case controller .CAM The atmospheric module is added CLUBB (Cloud Layers Unified by Binormals) Calculate turbulent activities in the boundary layer 、 Shallow convection 、 Cloud microphysics ,CLUBB It is a scheme for diagnosing wet turbulence , It can calculate the vertical velocity of joint high-order grids , Water content 、 Liquid water and potential temperature , You can also calculate the sub grid vertical flux ; Introduce an improved second-order diagnostic cloud microphysics scheme （MG2）, It can diagnose and calculate precipitation, including rain 、 Snow and condensation clouds .CAM Chemical module （CAM6-chem） Including convection chemistry scheme MOZART-T1; Calculate the secondary organic aerosol (SOA) Of VBS（volatility basis set） The scheme is coupled with the convective chemistry scheme , And has been continuously improving , So far CESM2.2.0 in , Realize the regional encryption MUSICA-V0, And it can directly configure and run MOZART-TS2 Chemical module and carry out nudging Waiting compset（ To configure ）.WACCM6 And CAM6 All physical parameterization schemes are consistent , And significant new functions are added in the middle and upper atmosphere . In order to provide representatives of stratospheric aerosols from volcanic and non volcanic gases ,WACCM6 extends Modal Aerosol Module (MAM4) function .CLM5.0 This version mainly improves the hydrological process of soil and vegetation 、 Dynamic process of snow melting 、 Carbon and nitrogen cycle and coupling simulation, vegetation simulation and other main dynamic processes , in addition , The model introduces MOSART Runoff model replaces RTM, At the same time, introduce FATES Ecological succession model to improve the classic dynamic vegetation model (DGVM). The number of underground floors is from CLM4.5 Medium 15 Layer increased to CLM5 Medium 25 layer , The spatial variable of soil thickness is considered . It is from 0.4 To 8.5m Change between . Besides , On the sea ice 、 There are major updates in modules such as Lu Bing . new CLM The forcing data is the third phase of the global soil moisture program (GSPW3) Development . It is also limited to land surface simulation LS3MIP and LUMIP Default data . The use of this mode requires strong theoretical knowledge and computer ability , Many users encounter many difficulties . To address these issues , Our hospital specially organizes CESM Course , Help students quickly solve CESM Problems in use , Improve the speed of scientific research output

Preparation before operation

CESM Operating system and software environment

CESM What operating environment is needed

CESM2.0 The construction of the operating environment

Linux System and compilation basis

CESM What you need to master in operation Linux And compilation knowledge

Linux Basic knowledge and operation of

Linux Compilation basis and operation examples

be based on Make and CMake Compilation system

CESM Basics

CESM Basic structure

CESM Several major functional modules of

CESM2.0 Basic knowledge of

CESM Program acquisition 、 Structure and function  

obtain CESM Program code ,CESM Folder structure and respective functions

Get the latest or specific version CESM Code

Explain CESM Folder structure functions

CESM transplant 、 Installation and fast operation  

CESM Preparation of operation environment , compile 、 Installation and operation

Check and improve CESM Environment and software required for operation

For specific server environments CESM Machine File modify

Create a simple case, Compile and run this case

【 Live class 】 Earth system model （CESM） Practical technology application and advanced training course

 CESM Configuration options and data file preparation

CESM Detailed explanation of the running configuration file , Preparation of data files required for operation

establish CESM case When the options and their significance

Run profile namelist Detailed explanation of , Selection of common options and their significance

function CESM Required data file structure and data file preparation method and procedure

Skillfully create according to the research content CESM case And run CESM

CESM Single module operation —— With CLM For example  

Have a good command of CESM Single module operation case establish 、 Document preparation and operation - With CLM For example

establish CLM Single point or area mode method

Preparation of documents required for single point and regional operation

Operation of single point and regional modes

CESM Part of the coupling operation ——CAM-chem + CLM 

Have a good command of CESM Some modules are coupled case establish 、 Document preparation and operation

The principle of partial coupling

CAM+CLM Instance creation and operation

CAM Development of ——CAM-chem、WACCM

CESM Fully coupled operation of

Have a good command of CESM Fully coupled case establish 、 Document preparation and operation

Precautions for fully coupled operation

Creation and operation of fully coupled instances  

CESM The result processing 、 Analysis and Visualization - With CLM For example  

Have a good command of CESM Output result file structure 、 Variable meaning 、 Variable selection and result analysis - With CLM For example

How to create a single point or area pattern

Preparation of documents required for single point and regional operation

Operation of single point and regional modes

CESM Code changes 、 Development and improvement

understand CESM The structure of the code 、 Composition of main modules 、Fortran Modification of procedures

understand CESM The main code structure

understand CESM The composition of several modules and the corresponding program location

Modify the code as needed , Compile operation